open files inside app

Open files directly inside the app.
Download file into cache beforehand if not already done.

supported file types:
jpg, .png, .gif, .mp3, .mp4, .mov, .wav, .txt, .md

thanks to @tobiasKaminsky and @starypatyk

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

CHANGELOG.md

@@ -7,6 +7,7 @@ Types of changes can be: Added/Changed/Deprecated/Removed/Fixed/Security
 
 ## [UNRELEASED]
 ### Added
+- open files inside app (jpg, .png, .gif, .mp3, .mp4, .mov, .wav, .txt, .md)
 - edit profile information and privacy settings
 
 ### Changed

app/build.gradle

@@ -128,7 +128,8 @@ android {
 ext {
     daggerVersion = "2.34.1"
     powermockVersion = "2.0.9"
-    workVersion = "1.0.1"
+    workVersion = "2.3.0"
+    markwonVersion =  "4.6.2"
 }
 
 
@@ -147,10 +148,10 @@ dependencies {
     implementation 'com.github.vanniktech:Emoji:0.6.0'
     implementation group: 'androidx.emoji', name: 'emoji-bundled', version: '1.1.0'
     implementation 'org.michaelevans.colorart:library:0.0.3'
-    implementation "android.arch.work:work-runtime:${workVersion}"
-    implementation "android.arch.work:work-rxjava2:${workVersion}"
+    implementation "androidx.work:work-runtime:${workVersion}"
+    implementation "androidx.work:work-rxjava2:${workVersion}"
+    androidTestImplementation "androidx.work:work-testing:${workVersion}"
     implementation 'com.google.android:flexbox:1.1.1'
-    androidTestImplementation "android.arch.work:work-testing:${workVersion}"
     implementation ('com.gitlab.bitfireAT:dav4jvm:f2078bc846', {
         exclude group: 'org.ogce', module: 'xpp3'	// Android comes with its own XmlPullParser
     })
@@ -242,6 +243,12 @@ dependencies {
     implementation 'com.afollestad.material-dialogs:lifecycle:3.1.0'
 
     implementation 'com.google.code.gson:gson:2.8.6'
+    implementation 'com.google.android.exoplayer:exoplayer:2.13.3'
+
+    implementation 'com.github.chrisbanes:PhotoView:2.0.0'
+    implementation 'pl.droidsonroids.gif:android-gif-drawable:1.2.23'
+
+    implementation "io.noties.markwon:core:$markwonVersion"
 
     //implementation 'com.github.dhaval2404:imagepicker:1.8'
     implementation 'com.github.tobiaskaminsky:ImagePicker:extraFile-SNAPSHOT'

app/src/main/AndroidManifest.xml

@@ -54,7 +54,7 @@
     <uses-permission android:name="android.permission.READ_CONTACTS" />
     <uses-permission android:name="android.permission.WRITE_CONTACTS" />
     <uses-permission android:name="android.permission.READ_PROFILE" />
-    
+
     <uses-permission android:name="android.permission.READ_SYNC_SETTINGS" />
     <uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS" />
     <uses-permission android:name="android.permission.MANAGE_ACCOUNTS" />
@@ -108,6 +108,24 @@
             android:configChanges="orientation|screenSize"
             android:launchMode="singleTask" />
 
+        <activity
+            android:name=".activities.FullScreenImageActivity"
+            android:theme="@style/FullScreenImageTheme"
+            android:configChanges="orientation|keyboardHidden|screenSize">
+        </activity>
+
+        <activity
+            android:name=".activities.FullScreenMediaActivity"
+            android:theme="@style/FullScreenMediaTheme"
+            android:configChanges="orientation|keyboardHidden|screenSize">
+        </activity>
+
+        <activity
+            android:name=".activities.FullScreenTextViewerActivity"
+            android:theme="@style/FullScreenTextTheme"
+            android:configChanges="orientation|keyboardHidden|screenSize">
+        </activity>
+
         <receiver android:name=".receivers.PackageReplacedReceiver">
             <intent-filter>
                 <action android:name="android.intent.action.MY_PACKAGE_REPLACED" />

app/src/main/java/com/nextcloud/talk/activities/FullScreenImageActivity.kt

@@ -0,0 +1,138 @@
+/*
+ * Nextcloud Talk application
+ *
+ * @author Marcel Hibbe
+ * @author Dariusz Olszewski
+ * Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
+ * Copyright (C) 2021 Dariusz Olszewski
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.nextcloud.talk.activities
+
+import android.content.Intent
+import android.net.Uri
+import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import android.view.View
+import android.widget.FrameLayout
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.FileProvider
+import com.github.chrisbanes.photoview.PhotoView
+import com.nextcloud.talk.BuildConfig
+import com.nextcloud.talk.R
+import pl.droidsonroids.gif.GifDrawable
+import pl.droidsonroids.gif.GifImageView
+import java.io.File
+
+
+class FullScreenImageActivity : AppCompatActivity() {
+
+    private lateinit var path: String
+    private lateinit var imageWrapperView: FrameLayout
+    private lateinit var photoView: PhotoView
+    private lateinit var gifView: GifImageView
+
+    private var showFullscreen = false
+
+    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+        menuInflater.inflate(R.menu.menu_preview, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        return if (item.itemId == R.id.share) {
+            val shareUri = FileProvider.getUriForFile(this,
+                    BuildConfig.APPLICATION_ID,
+                    File(path))
+
+            val shareIntent: Intent = Intent().apply {
+                action = Intent.ACTION_SEND
+                putExtra(Intent.EXTRA_STREAM, shareUri)
+                type = "image/*"
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            }
+            startActivity(Intent.createChooser(shareIntent, resources.getText(R.string.send_to)))
+
+            true
+        } else {
+            super.onOptionsItemSelected(item)
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        setContentView(R.layout.activity_full_screen_image)
+        setSupportActionBar(findViewById(R.id.imageview_toolbar))
+        supportActionBar?.setDisplayShowTitleEnabled(false);
+
+        imageWrapperView = findViewById(R.id.image_wrapper_view)
+        photoView = findViewById(R.id.photo_view)
+        gifView = findViewById(R.id.gif_view)
+
+        photoView.setOnPhotoTapListener{ view, x, y ->
+            toggleFullscreen()
+        }
+        photoView.setOnOutsidePhotoTapListener{
+            toggleFullscreen()
+        }
+        gifView.setOnClickListener{
+            toggleFullscreen()
+        }
+
+        val fileName = intent.getStringExtra("FILE_NAME")
+        val isGif = intent.getBooleanExtra("IS_GIF", false)
+
+        path = applicationContext.cacheDir.absolutePath + "/" + fileName
+        if (isGif) {
+            photoView.visibility = View.INVISIBLE
+            gifView.visibility = View.VISIBLE
+            val gifFromUri = GifDrawable(path)
+            gifView.setImageDrawable(gifFromUri)
+        } else {
+            gifView.visibility = View.INVISIBLE
+            photoView.visibility = View.VISIBLE
+            photoView.setImageURI(Uri.parse(path))
+        }
+    }
+
+    private fun toggleFullscreen(){
+        showFullscreen = !showFullscreen;
+        if (showFullscreen){
+            hideSystemUI()
+            supportActionBar?.hide()
+        } else{
+            showSystemUI()
+            supportActionBar?.show()
+        }
+    }
+
+    private fun hideSystemUI() {
+        window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_IMMERSIVE
+                or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                or View.SYSTEM_UI_FLAG_FULLSCREEN)
+    }
+
+    private fun showSystemUI() {
+        window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)
+    }
+}

app/src/main/java/com/nextcloud/talk/activities/FullScreenMediaActivity.kt

@@ -0,0 +1,147 @@
+/*
+ * Nextcloud Talk application
+ *
+ * @author Marcel Hibbe
+ * Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.nextcloud.talk.activities
+
+import android.content.Intent
+import android.os.Bundle
+import android.util.Log
+import android.view.Menu
+import android.view.MenuItem
+import android.view.View
+import android.view.WindowManager
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.FileProvider
+import autodagger.AutoInjector
+import com.google.android.exoplayer2.MediaItem
+import com.google.android.exoplayer2.Player
+import com.google.android.exoplayer2.SimpleExoPlayer
+import com.google.android.exoplayer2.ui.PlayerControlView
+import com.google.android.exoplayer2.ui.StyledPlayerView
+import com.nextcloud.talk.BuildConfig
+import com.nextcloud.talk.R
+import com.nextcloud.talk.application.NextcloudTalkApplication
+import java.io.File
+
+@AutoInjector(NextcloudTalkApplication::class)
+class FullScreenMediaActivity : AppCompatActivity(), Player.EventListener {
+
+    private lateinit var path: String
+    private lateinit var playerView: StyledPlayerView
+    private lateinit var player: SimpleExoPlayer
+
+    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+        menuInflater.inflate(R.menu.menu_preview, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        return if (item.itemId == R.id.share) {
+            val shareUri = FileProvider.getUriForFile(this,
+                    BuildConfig.APPLICATION_ID,
+                    File(path))
+
+            val shareIntent: Intent = Intent().apply {
+                action = Intent.ACTION_SEND
+                putExtra(Intent.EXTRA_STREAM, shareUri)
+                type = "video/*"
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            }
+            startActivity(Intent.createChooser(shareIntent, resources.getText(R.string.send_to)))
+
+            true
+        } else {
+            super.onOptionsItemSelected(item)
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        val fileName = intent.getStringExtra("FILE_NAME")
+        val isAudioOnly = intent.getBooleanExtra("AUDIO_ONLY", false)
+
+        path = applicationContext.cacheDir.absolutePath + "/" + fileName
+
+        setContentView(R.layout.activity_full_screen_media)
+        setSupportActionBar(findViewById(R.id.mediaview_toolbar))
+        supportActionBar?.setDisplayShowTitleEnabled(false);
+
+        playerView = findViewById(R.id.player_view)
+
+        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+
+        playerView.showController()
+        if (isAudioOnly) {
+            playerView.controllerShowTimeoutMs = 0
+        }
+
+        playerView.setControllerVisibilityListener { v ->
+            if (v != 0) {
+                hideSystemUI()
+                supportActionBar?.hide()
+            } else {
+                showSystemUI()
+                supportActionBar?.show()
+            }
+        }
+    }
+
+    override fun onStart() {
+        super.onStart()
+        initializePlayer()
+
+        val mediaItem: MediaItem = MediaItem.fromUri(path)
+        player.setMediaItem(mediaItem)
+        player.prepare()
+        player.play()
+    }
+
+    override fun onStop() {
+        super.onStop()
+        releasePlayer()
+    }
+
+    private fun initializePlayer() {
+        player = SimpleExoPlayer.Builder(applicationContext).build()
+        playerView.player = player;
+        player.playWhenReady = true
+        player.addListener(this)
+    }
+
+    private fun releasePlayer() {
+        player.release()
+    }
+
+    private fun hideSystemUI() {
+        window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_IMMERSIVE
+                or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                or View.SYSTEM_UI_FLAG_FULLSCREEN)
+    }
+
+    private fun showSystemUI() {
+        window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)
+    }
+}

app/src/main/java/com/nextcloud/talk/activities/FullScreenTextViewerActivity.kt

@@ -0,0 +1,93 @@
+/*
+ * Nextcloud Talk application
+ *
+ * @author Marcel Hibbe
+ * Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.nextcloud.talk.activities
+
+import android.content.Intent
+import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.FileProvider
+import autodagger.AutoInjector
+import com.nextcloud.talk.BuildConfig
+import com.nextcloud.talk.R
+import com.nextcloud.talk.application.NextcloudTalkApplication
+import io.noties.markwon.Markwon
+import java.io.File
+
+
+@AutoInjector(NextcloudTalkApplication::class)
+class FullScreenTextViewerActivity : AppCompatActivity() {
+
+    private lateinit var path: String
+    private lateinit var textView: TextView
+
+    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+        menuInflater.inflate(R.menu.menu_preview, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        return if (item.itemId == R.id.share) {
+            val shareUri = FileProvider.getUriForFile(this,
+                    BuildConfig.APPLICATION_ID,
+                    File(path))
+
+            val shareIntent: Intent = Intent().apply {
+                action = Intent.ACTION_SEND
+                putExtra(Intent.EXTRA_STREAM, shareUri)
+                type = "text/*"
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            }
+            startActivity(Intent.createChooser(shareIntent, resources.getText(R.string.send_to)))
+
+            true
+        } else {
+            super.onOptionsItemSelected(item)
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        setContentView(R.layout.activity_full_screen_text)
+        setSupportActionBar(findViewById(R.id.textview_toolbar))
+        supportActionBar?.setDisplayShowTitleEnabled(false);
+
+        textView = findViewById(R.id.text_view)
+
+        val fileName = intent.getStringExtra("FILE_NAME")
+        val isMarkdown = intent.getBooleanExtra("IS_MARKDOWN", false)
+        path = applicationContext.cacheDir.absolutePath + "/" + fileName
+        var text = readFile(path)
+
+        if (isMarkdown) {
+            val markwon = Markwon.create(applicationContext);
+            markwon.setMarkdown(textView, text);
+        } else {
+            textView.text = text
+        }
+    }
+
+    private fun readFile(fileName: String) = File(fileName).inputStream().readBytes().toString(Charsets.UTF_8)
+
+}

app/src/main/java/com/nextcloud/talk/adapters/messages/MagicPreviewMessageViewHolder.java

@@ -2,7 +2,9 @@
  * Nextcloud Talk application
  *
  * @author Mario Danic
+ * @author Marcel Hibbe
  * Copyright (C) 2017-2018 Mario Danic <mario@lovelyhq.com>
+ * Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -28,19 +30,21 @@ import android.graphics.drawable.Drawable;
 import android.graphics.drawable.LayerDrawable;
 import android.net.Uri;
 import android.os.Handler;
+import android.util.Log;
+import android.view.Gravity;
 import android.view.View;
-import android.widget.TextView;
+import android.widget.PopupMenu;
 
-import androidx.emoji.widget.EmojiTextView;
-
-import autodagger.AutoInjector;
-import butterknife.BindView;
-import butterknife.ButterKnife;
+import com.google.common.util.concurrent.ListenableFuture;
 import com.nextcloud.talk.R;
+import com.nextcloud.talk.activities.FullScreenImageActivity;
+import com.nextcloud.talk.activities.FullScreenMediaActivity;
+import com.nextcloud.talk.activities.FullScreenTextViewerActivity;
 import com.nextcloud.talk.application.NextcloudTalkApplication;
 import com.nextcloud.talk.components.filebrowser.models.BrowserFile;
 import com.nextcloud.talk.components.filebrowser.models.DavResponse;
 import com.nextcloud.talk.components.filebrowser.webdav.ReadFilesystemOperation;
+import com.nextcloud.talk.jobs.DownloadFileToCacheWorker;
 import com.nextcloud.talk.models.database.UserEntity;
 import com.nextcloud.talk.models.json.chat.ChatMessage;
 import com.nextcloud.talk.utils.AccountUtils;
@@ -48,22 +52,39 @@ import com.nextcloud.talk.utils.DisplayUtils;
 import com.nextcloud.talk.utils.DrawableUtils;
 import com.nextcloud.talk.utils.bundle.BundleKeys;
 import com.stfalcon.chatkit.messages.MessageHolders;
+
+import java.io.File;
+import java.util.List;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+
+import javax.inject.Inject;
+
+import androidx.core.content.ContextCompat;
+import androidx.emoji.widget.EmojiTextView;
+import androidx.work.Data;
+import androidx.work.OneTimeWorkRequest;
+import androidx.work.WorkInfo;
+import androidx.work.WorkManager;
+import autodagger.AutoInjector;
+import butterknife.BindView;
+import butterknife.ButterKnife;
 import io.reactivex.Single;
 import io.reactivex.SingleObserver;
 import io.reactivex.disposables.Disposable;
 import io.reactivex.schedulers.Schedulers;
 import okhttp3.OkHttpClient;
 
-import javax.inject.Inject;
-import java.util.List;
-import java.util.concurrent.Callable;
-
 @AutoInjector(NextcloudTalkApplication.class)
 public class MagicPreviewMessageViewHolder extends MessageHolders.IncomingImageMessageViewHolder<ChatMessage> {
 
+    private static String TAG = "MagicPreviewMessageViewHolder";
+
     @BindView(R.id.messageText)
     EmojiTextView messageText;
 
+    View progressBar;
+
     @Inject
     Context context;
 
@@ -73,6 +94,7 @@ public class MagicPreviewMessageViewHolder extends MessageHolders.IncomingImageM
     public MagicPreviewMessageViewHolder(View itemView) {
         super(itemView);
         ButterKnife.bind(this, itemView);
+        progressBar = itemView.findViewById(R.id.progress_bar);
         NextcloudTalkApplication.Companion.getSharedApplication().getComponentApplication().inject(this);
     }
 
@@ -102,35 +124,54 @@ public class MagicPreviewMessageViewHolder extends MessageHolders.IncomingImageM
         }
 
         if (message.getMessageType() == ChatMessage.MessageType.SINGLE_NC_ATTACHMENT_MESSAGE) {
-            // it's a preview for a Nextcloud share
-            messageText.setText(message.getSelectedIndividualHashMap().get("name"));
-            DisplayUtils.setClickableString(message.getSelectedIndividualHashMap().get("name"), message.getSelectedIndividualHashMap().get("link"), messageText);
+            String fileName = message.getSelectedIndividualHashMap().get("name");
+            messageText.setText(fileName);
             if (message.getSelectedIndividualHashMap().containsKey("mimetype")) {
-                image.getHierarchy().setPlaceholderImage(context.getDrawable(DrawableUtils.INSTANCE.getDrawableResourceIdForMimeType(message.getSelectedIndividualHashMap().get("mimetype"))));
+                String mimetype = message.getSelectedIndividualHashMap().get("mimetype");
+                int drawableResourceId = DrawableUtils.INSTANCE.getDrawableResourceIdForMimeType(mimetype);
+                Drawable drawable = ContextCompat.getDrawable(context, drawableResourceId);
+                image.getHierarchy().setPlaceholderImage(drawable);
             } else {
                 fetchFileInformation("/" + message.getSelectedIndividualHashMap().get("path"), message.activeUser);
             }
 
-            image.setOnClickListener(v -> {
+            String accountString =
+                    message.activeUser.getUsername() + "@" + message.activeUser.getBaseUrl().replace("https://", "").replace("http://", "");
 
-                String accountString =
-                        message.activeUser.getUsername() + "@" + message.activeUser.getBaseUrl().replace("https://", "").replace("http://", "");
-
-                if (AccountUtils.INSTANCE.canWeOpenFilesApp(context, accountString)) {
-                    Intent filesAppIntent = new Intent(Intent.ACTION_VIEW, null);
-                    final ComponentName componentName = new ComponentName(context.getString(R.string.nc_import_accounts_from), "com.owncloud.android.ui.activity.FileDisplayActivity");
-                    filesAppIntent.setComponent(componentName);
-                    filesAppIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-                    filesAppIntent.setPackage(context.getString(R.string.nc_import_accounts_from));
-                    filesAppIntent.putExtra(BundleKeys.INSTANCE.getKEY_ACCOUNT(), accountString);
-                    filesAppIntent.putExtra(BundleKeys.INSTANCE.getKEY_FILE_ID(), message.getSelectedIndividualHashMap().get("id"));
-                    context.startActivity(filesAppIntent);
+            image.setOnClickListener(v -> {
+                String mimetype = message.getSelectedIndividualHashMap().get("mimetype");
+                if (isSupportedMimetype(mimetype)) {
+                    openOrDownloadFile(message);
                 } else {
-                    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(message.getSelectedIndividualHashMap().get("link")));
-                    browserIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-                    context.startActivity(browserIntent);
+                    openFileInFilesApp(message, accountString);
                 }
             });
+
+            image.setOnLongClickListener(l -> {
+                onMessageViewLongClick(message, accountString);
+                return true;
+            });
+
+            // check if download worker is already running
+            String fileId = message.getSelectedIndividualHashMap().get("id");
+            ListenableFuture<List<WorkInfo>> workers = WorkManager.getInstance(context).getWorkInfosByTag(fileId);
+
+            try {
+                for (WorkInfo workInfo : workers.get()) {
+                    if (workInfo.getState() == WorkInfo.State.RUNNING || workInfo.getState() == WorkInfo.State.ENQUEUED) {
+                        progressBar.setVisibility(View.VISIBLE);
+
+                        String mimetype = message.getSelectedIndividualHashMap().get("mimetype");
+
+                        WorkManager.getInstance(context).getWorkInfoByIdLiveData(workInfo.getId()).observeForever(info -> {
+                            updateViewsByProgress(fileName, mimetype, info);
+                        });
+                    }
+                }
+            } catch (ExecutionException | InterruptedException e) {
+                Log.e(TAG, "Error when checking if worker already exists", e);
+            }
+
         } else if (message.getMessageType() == ChatMessage.MessageType.SINGLE_LINK_GIPHY_MESSAGE) {
             messageText.setText("GIPHY");
             DisplayUtils.setClickableString("GIPHY", "https://giphy.com", messageText);
@@ -151,6 +192,222 @@ public class MagicPreviewMessageViewHolder extends MessageHolders.IncomingImageM
         }
     }
 
+    public boolean isSupportedMimetype(String mimetype){
+        switch (mimetype) {
+            case "image/png":
+            case "image/jpeg":
+            case "image/gif":
+            case "audio/mpeg":
+            case "audio/wav":
+            case "audio/ogg":
+            case "video/mp4":
+            case "video/quicktime":
+            case "video/ogg":
+            case "text/markdown":
+            case "text/plain":
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    private void openOrDownloadFile(ChatMessage message) {
+        String filename = message.getSelectedIndividualHashMap().get("name");
+        String mimetype = message.getSelectedIndividualHashMap().get("mimetype");
+        File file = new File(context.getCacheDir(), filename);
+        if (file.exists()) {
+            openFile(filename, mimetype);
+        } else {
+            String size = message.getSelectedIndividualHashMap().get("size");
+
+            if (size == null) {
+                size = "-1";
+            }
+            Integer fileSize = Integer.valueOf(size);
+
+            String fileId = message.getSelectedIndividualHashMap().get("id");
+            String path = message.getSelectedIndividualHashMap().get("path");
+            downloadFileToCache(
+                    message.activeUser.getBaseUrl(),
+                    message.activeUser.getUserId(),
+                    message.activeUser.getAttachmentFolder(),
+                    filename,
+                    path,
+                    mimetype,
+                    fileSize,
+                    fileId
+            );
+        }
+    }
+
+    private void openFile(String filename, String mimetype) {
+        switch (mimetype) {
+            case "audio/mpeg":
+            case "audio/wav":
+            case "audio/ogg":
+            case "video/mp4":
+            case "video/quicktime":
+            case "video/ogg":
+                openMediaView(filename, mimetype);
+                break;
+            case "image/png":
+            case "image/jpeg":
+            case "image/gif":
+                openImageView(filename, mimetype);
+                break;
+            case "text/markdown":
+            case "text/plain":
+                openTextView(filename, mimetype);
+                break;
+            default:
+                Log.w(TAG, "no method defined for mimetype: " + mimetype);
+        }
+    }
+
+    private void openImageView(String filename, String mimetype) {
+        Intent fullScreenImageIntent = new Intent(context, FullScreenImageActivity.class);
+        fullScreenImageIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        fullScreenImageIntent.putExtra("FILE_NAME", filename);
+        fullScreenImageIntent.putExtra("IS_GIF", isGif(mimetype));
+        context.startActivity(fullScreenImageIntent);
+    }
+
+    private void openFileInFilesApp(ChatMessage message, String accountString) {
+        if (AccountUtils.INSTANCE.canWeOpenFilesApp(context, accountString)) {
+            Intent filesAppIntent = new Intent(Intent.ACTION_VIEW, null);
+            final ComponentName componentName = new ComponentName(context.getString(R.string.nc_import_accounts_from), "com.owncloud.android.ui.activity.FileDisplayActivity");
+            filesAppIntent.setComponent(componentName);
+            filesAppIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            filesAppIntent.setPackage(context.getString(R.string.nc_import_accounts_from));
+            filesAppIntent.putExtra(BundleKeys.INSTANCE.getKEY_ACCOUNT(), accountString);
+            filesAppIntent.putExtra(BundleKeys.INSTANCE.getKEY_FILE_ID(), message.getSelectedIndividualHashMap().get("id"));
+            context.startActivity(filesAppIntent);
+        } else {
+            Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(message.getSelectedIndividualHashMap().get("link")));
+            browserIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            context.startActivity(browserIntent);
+        }
+    }
+
+    private void onMessageViewLongClick(ChatMessage message, String accountString) {
+        if (isSupportedMimetype(message.getSelectedIndividualHashMap().get("mimetype"))) {
+            return;
+        }
+
+        PopupMenu popupMenu = new PopupMenu(this.context, itemView, Gravity.START);
+        popupMenu.inflate(R.menu.chat_preview_message_menu);
+
+        popupMenu.setOnMenuItemClickListener(item -> {
+            openFileInFilesApp(message, accountString);
+            return true;
+        });
+
+        popupMenu.show();
+    }
+
+    private void downloadFileToCache(String baseUrl,
+                                     String userId,
+                                     String attachmentFolder,
+                                     String fileName,
+                                     String path,
+                                     String mimetype,
+                                     Integer size,
+                                     String fileId) {
+
+        // check if download worker is already running
+        ListenableFuture<List<WorkInfo>> workers = WorkManager.getInstance(context).getWorkInfosByTag(fileId);
+
+        try {
+            for (WorkInfo workInfo : workers.get()) {
+                if (workInfo.getState() == WorkInfo.State.RUNNING || workInfo.getState() == WorkInfo.State.ENQUEUED) {
+                    Log.d("Download", "Download worker for " + fileId + " is already running or scheduled");
+                    return;
+                }
+            }
+        } catch (ExecutionException | InterruptedException e) {
+            Log.e(TAG, "Error when checking if worker already exsists", e);
+        }
+
+        Data data;
+        OneTimeWorkRequest downloadWorker;
+
+        data = new Data.Builder()
+                .putString(DownloadFileToCacheWorker.KEY_BASE_URL, baseUrl)
+                .putString(DownloadFileToCacheWorker.KEY_USER_ID, userId)
+                .putString(DownloadFileToCacheWorker.KEY_ATTACHMENT_FOLDER, attachmentFolder)
+                .putString(DownloadFileToCacheWorker.KEY_FILE_NAME, fileName)
+                .putString(DownloadFileToCacheWorker.KEY_FILE_PATH, path)
+                .putInt(DownloadFileToCacheWorker.KEY_FILE_SIZE, size)
+                .build();
+
+        downloadWorker = new OneTimeWorkRequest.Builder(DownloadFileToCacheWorker.class)
+                .setInputData(data)
+                .addTag(fileId)
+                .build();
+
+        WorkManager.getInstance().enqueue(downloadWorker);
+
+        progressBar.setVisibility(View.VISIBLE);
+
+        WorkManager.getInstance(context).getWorkInfoByIdLiveData(downloadWorker.getId()).observeForever(workInfo -> {
+            updateViewsByProgress(fileName, mimetype, workInfo);
+        });
+    }
+
+    private void updateViewsByProgress(String fileName, String mimetype, WorkInfo workInfo) {
+        switch (workInfo.getState()) {
+            case RUNNING:
+                int progress = workInfo.getProgress().getInt(DownloadFileToCacheWorker.PROGRESS, -1);
+                if (progress > -1) {
+                    messageText.setText(String.format(context.getResources().getString(R.string.filename_progress), fileName, progress));
+                }
+                break;
+
+            case SUCCEEDED:
+                if (image.isShown()) {
+                    openFile(fileName, mimetype);
+                } else {
+                    Log.d(TAG, "image " + fileName + " was downloaded but it's not opened (view is not shown)");
+                }
+                messageText.setText(fileName);
+                progressBar.setVisibility(View.GONE);
+                break;
+
+            case FAILED:
+                messageText.setText(fileName);
+                progressBar.setVisibility(View.GONE);
+                break;
+        }
+    }
+
+    private void openMediaView(String filename, String mimetype) {
+        Intent fullScreenMediaIntent = new Intent(context, FullScreenMediaActivity.class);
+        fullScreenMediaIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        fullScreenMediaIntent.putExtra("FILE_NAME", filename);
+        fullScreenMediaIntent.putExtra("AUDIO_ONLY", isAudioOnly(mimetype));
+        context.startActivity(fullScreenMediaIntent);
+    }
+
+    private void openTextView(String filename, String mimetype) {
+        Intent fullScreenTextViewerIntent = new Intent(context, FullScreenTextViewerActivity.class);
+        fullScreenTextViewerIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        fullScreenTextViewerIntent.putExtra("FILE_NAME", filename);
+        fullScreenTextViewerIntent.putExtra("IS_MARKDOWN", isMarkdown(mimetype));
+        context.startActivity(fullScreenTextViewerIntent);
+    }
+
+    private boolean isGif(String mimetype) {
+        return ("image/gif").equals(mimetype);
+    }
+
+    private boolean isMarkdown(String mimetype) {
+        return ("text/markdown").equals(mimetype);
+    }
+
+    private boolean isAudioOnly(String mimetype) {
+        return mimetype.startsWith("audio");
+    }
+
     private void fetchFileInformation(String url, UserEntity activeUser) {
         Single.fromCallable(new Callable<ReadFilesystemOperation>() {
             @Override

app/src/main/java/com/nextcloud/talk/api/NcApi.java

@@ -3,7 +3,9 @@
  *   Nextcloud Talk application
  *
  *   @author Mario Danic
+ *   @author Marcel Hibbe
  *   Copyright (C) 2017 Mario Danic (mario@lovelyhq.com)
+ *   Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
  *
  *   This program is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -374,6 +376,10 @@ public interface NcApi {
                                                     @Url String url,
                                                     @Body RequestBody body);
 
+    @GET
+    Call<ResponseBody> downloadFile(@Header("Authorization") String authorization,
+                                    @Url String url);
+
     @DELETE
     Observable<ChatOverallSingleMessage> deleteChatMessage(@Header("Authorization") String authorization,
                                                            @Url String url);

app/src/main/java/com/nextcloud/talk/controllers/ChatController.kt

@@ -2,7 +2,9 @@
  * Nextcloud Talk application
  *
  * @author Mario Danic
+ * @author Marcel Hibbe
  * Copyright (C) 2017-2019 Mario Danic <mario@lovelyhq.com>
+ * Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -435,8 +437,7 @@ class ChatController(args: Bundle) : BaseController(args), MessagesListAdapter
 
                 if (newState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE) {
                     if (newMessagesCount != 0 && layoutManager != null) {
-                        if (layoutManager!!.findFirstCompletelyVisibleItemPosition() <
-                                newMessagesCount) {
+                        if (layoutManager!!.findFirstCompletelyVisibleItemPosition() < newMessagesCount) {
                             newMessagesCount = 0
 
                             if (popupBubble != null && popupBubble!!.isShown) {

app/src/main/java/com/nextcloud/talk/jobs/DownloadFileToCacheWorker.kt

@@ -0,0 +1,157 @@
+/*
+ * Nextcloud Talk application
+ *
+ * @author Marcel Hibbe
+ * Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.nextcloud.talk.jobs
+
+import android.content.Context
+import android.util.Log
+import androidx.work.Data
+import androidx.work.Worker
+import androidx.work.WorkerParameters
+import autodagger.AutoInjector
+import com.nextcloud.talk.api.NcApi
+import com.nextcloud.talk.application.NextcloudTalkApplication
+import com.nextcloud.talk.models.database.UserEntity
+import com.nextcloud.talk.utils.ApiUtils
+import com.nextcloud.talk.utils.database.user.UserUtils
+import com.nextcloud.talk.utils.preferences.AppPreferences
+import okhttp3.ResponseBody
+import java.io.*
+import javax.inject.Inject
+
+
+@AutoInjector(NextcloudTalkApplication::class)
+class DownloadFileToCacheWorker(val context: Context, workerParameters: WorkerParameters) :
+        Worker(context, workerParameters) {
+
+    private var totalFileSize: Int = -1
+
+    @Inject
+    lateinit var ncApi: NcApi
+
+    @Inject
+    lateinit var userUtils: UserUtils
+
+    @Inject
+    lateinit var appPreferences: AppPreferences
+
+    override fun doWork(): Result {
+        NextcloudTalkApplication.sharedApplication!!.componentApplication.inject(this)
+
+        if (totalFileSize > -1) {
+            setProgressAsync(Data.Builder().putInt(PROGRESS, 0).build())
+        }
+
+        try {
+            val currentUser = userUtils.currentUser
+            val baseUrl = inputData.getString(KEY_BASE_URL)
+            val userId = inputData.getString(KEY_USER_ID)
+            val attachmentFolder = inputData.getString(KEY_ATTACHMENT_FOLDER)
+            val fileName = inputData.getString(KEY_FILE_NAME)
+            val remotePath = inputData.getString(KEY_FILE_PATH)
+            totalFileSize = (inputData.getInt(KEY_FILE_SIZE, -1))
+
+            checkNotNull(currentUser)
+            checkNotNull(baseUrl)
+            checkNotNull(userId)
+            checkNotNull(attachmentFolder)
+            checkNotNull(fileName)
+            checkNotNull(remotePath)
+
+            val url = ApiUtils.getUrlForFileDownload(baseUrl, userId, remotePath)
+
+            return downloadFile(currentUser, url, fileName)
+        } catch (e: IllegalStateException) {
+            Log.e(javaClass.simpleName, "Something went wrong when trying to download file", e)
+            return Result.failure()
+        }
+    }
+
+    private fun downloadFile(currentUser: UserEntity, url: String, fileName: String): Result {
+        val downloadCall = ncApi.downloadFile(
+                ApiUtils.getCredentials(currentUser.username, currentUser.token),
+                url)
+
+        return executeDownload(downloadCall.execute().body(), fileName)
+    }
+
+    private fun executeDownload(body: ResponseBody?, fileName: String): Result {
+        if (body == null) {
+            Log.e(TAG, "Response body when downloading $fileName is null!")
+            return Result.failure()
+        }
+
+        var count: Int
+        val data = ByteArray(1024 * 4)
+        val bis: InputStream = BufferedInputStream(body.byteStream(), 1024 * 8)
+        val outputFile = File(context.cacheDir, fileName + "_")
+        val output: OutputStream = FileOutputStream(outputFile)
+        var total: Long = 0
+        val startTime = System.currentTimeMillis()
+        var timeCount = 1
+
+        count = bis.read(data)
+
+        while (count != -1) {
+            if (totalFileSize > -1) {
+                total += count.toLong()
+                val progress = (total * 100 / totalFileSize).toInt()
+                val currentTime = System.currentTimeMillis() - startTime
+                if (currentTime > 50 * timeCount) {
+                    setProgressAsync(Data.Builder().putInt(PROGRESS, progress).build())
+                    timeCount++
+                }
+            }
+            output.write(data, 0, count)
+            count = bis.read(data)
+        }
+
+        output.flush()
+        output.close()
+        bis.close()
+
+        return onDownloadComplete(fileName)
+    }
+
+    private fun onDownloadComplete(fileName: String): Result {
+        val tempFile = File(context.cacheDir, fileName + "_")
+        val targetFile = File(context.cacheDir, fileName)
+
+        return if (tempFile.renameTo(targetFile)) {
+            setProgressAsync(Data.Builder().putBoolean(SUCCESS, true).build())
+            Result.success()
+        } else {
+            Result.failure()
+        }
+    }
+
+    companion object {
+        const val TAG = "DownloadFileToCache"
+        const val KEY_BASE_URL = "KEY_BASE_URL"
+        const val KEY_USER_ID = "KEY_USER_ID"
+        const val KEY_ATTACHMENT_FOLDER = "KEY_ATTACHMENT_FOLDER"
+        const val KEY_FILE_NAME = "KEY_FILE_NAME"
+        const val KEY_FILE_PATH = "KEY_FILE_PATH"
+        const val KEY_FILE_SIZE = "KEY_FILE_SIZE"
+        const val PROGRESS = "PROGRESS"
+        const val SUCCESS = "SUCCESS"
+
+    }
+}

app/src/main/java/com/nextcloud/talk/jobs/UploadAndShareFilesWorker.kt

@@ -21,9 +21,7 @@
 package com.nextcloud.talk.jobs
 
 import android.content.Context
-import android.database.Cursor
 import android.net.Uri
-import android.provider.OpenableColumns
 import android.util.Log
 import androidx.work.*
 import autodagger.AutoInjector
@@ -45,6 +43,8 @@ import io.reactivex.schedulers.Schedulers
 import okhttp3.MediaType
 import okhttp3.RequestBody
 import retrofit2.Response
+import java.io.File
+import java.io.FileOutputStream
 import java.io.InputStream
 import java.util.*
 import javax.inject.Inject
@@ -80,9 +80,9 @@ class UploadAndShareFilesWorker(val context: Context, workerParameters: WorkerPa
 
             for (index in sourcefiles.indices) {
                 val sourcefileUri = Uri.parse(sourcefiles[index])
-                var filename = UriUtils.getFileName(sourcefileUri, context)
+                val filename = UriUtils.getFileName(sourcefileUri, context)
                 val requestBody = createRequestBody(sourcefileUri)
-                uploadFile(currentUser, ncTargetpath, filename, roomToken, requestBody)
+                uploadFile(currentUser, ncTargetpath, filename, roomToken, requestBody, sourcefileUri)
             }
         } catch (e: IllegalStateException) {
             Log.e(javaClass.simpleName, "Something went wrong when trying to upload file", e)
@@ -107,7 +107,8 @@ class UploadAndShareFilesWorker(val context: Context, workerParameters: WorkerPa
         return requestBody
     }
 
-    private fun uploadFile(currentUser: UserEntity, ncTargetpath: String?, filename: String?, roomToken: String?, requestBody: RequestBody?) {
+    private fun uploadFile(currentUser: UserEntity, ncTargetpath: String?, filename: String, roomToken: String?,
+                           requestBody: RequestBody?, sourcefileUri: Uri) {
         ncApi.uploadFile(
                 ApiUtils.getCredentials(currentUser.username, currentUser.token),
                 ApiUtils.getUrlForFileUpload(currentUser.baseUrl, currentUser.userId, ncTargetpath, filename),
@@ -128,10 +129,23 @@ class UploadAndShareFilesWorker(val context: Context, workerParameters: WorkerPa
 
                     override fun onComplete() {
                         shareFile(roomToken, currentUser, ncTargetpath, filename)
+                        copyFileToCache(sourcefileUri, filename)
                     }
                 })
     }
 
+    private fun copyFileToCache(sourceFileUri: Uri, filename: String) {
+        val cachedFile = File(context.cacheDir, filename)
+        val outputStream = FileOutputStream(cachedFile)
+        val inputStream: InputStream = context.contentResolver.openInputStream(sourceFileUri)!!
+
+        inputStream.use { input ->
+            outputStream.use { output ->
+                input.copyTo(output)
+            }
+        }
+    }
+
     private fun shareFile(roomToken: String?, currentUser: UserEntity, ncTargetpath: String?, filename: String?) {
         val paths: MutableList<String> = ArrayList()
         paths.add("$ncTargetpath/$filename")

app/src/main/java/com/nextcloud/talk/utils/ApiUtils.java

@@ -299,6 +299,10 @@ public class ApiUtils {
         return baseUrl + "/remote.php/dav/files/" + user + attachmentFolder + "/" + filename;
     }
 
+    public static String getUrlForFileDownload(String baseUrl, String user, String remotePath) {
+        return baseUrl + "/remote.php/dav/files/" + user + "/" + remotePath;
+    }
+
     public static String getUrlForMessageDeletion(String baseUrl, String token, String messageId) {
         return baseUrl + ocsApiVersion + spreedApiVersion + "/chat/" + token + "/" + messageId;
     }

app/src/main/java/com/nextcloud/talk/utils/UriUtils.kt

@@ -42,7 +42,7 @@ object UriUtils {
             }
         }
         if (filename == null) {
-            Log.e(UploadAndShareFilesWorker.TAG, "failed to get DISPLAY_NAME from uri. using fallback.")
+            Log.e("UriUtils", "failed to get DISPLAY_NAME from uri. using fallback.")
             filename = uri.path
             val lastIndexOfSlash = filename!!.lastIndexOf('/')
             if (lastIndexOfSlash != -1) {

app/src/main/res/layout/activity_full_screen_image.xml

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Nextcloud Talk application
+  ~
+  ~ @author Marcel Hibbe
+  ~ @author Dariusz Olszewski
+  ~ Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
+  ~ Copyright (C) 2021 Dariusz Olszewski
+  ~
+  ~ This program is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation, either version 3 of the License, or
+  ~ at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~ GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/image_wrapper_view"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@android:color/black"
+    android:fitsSystemWindows="true"
+    tools:context=".activities.FullScreenImageActivity">
+
+    <androidx.appcompat.widget.Toolbar
+        android:id="@+id/imageview_toolbar"
+        android:layout_width="match_parent"
+        android:layout_height="?attr/actionBarSize"
+        android:elevation="4dp"
+        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
+        app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
+
+    <com.github.chrisbanes.photoview.PhotoView
+        android:id="@+id/photo_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="invisible" />
+
+    <pl.droidsonroids.gif.GifImageView
+        android:id="@+id/gif_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="invisible"
+        />
+
+</FrameLayout>

app/src/main/res/layout/activity_full_screen_media.xml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Nextcloud Talk application
+  ~
+  ~ @author Marcel Hibbe
+  ~ Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
+  ~
+  ~ This program is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation, either version 3 of the License, or
+  ~ at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~ GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@android:color/black"
+    android:fitsSystemWindows="true"
+    tools:context=".activities.FullScreenMediaActivity">
+
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/mediaview_toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            android:elevation="4dp"
+            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
+            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
+
+        <com.google.android.exoplayer2.ui.StyledPlayerView
+            android:id="@+id/player_view"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            app:show_buffering="when_playing"
+            app:show_shuffle_button="true"/>
+
+</FrameLayout>

app/src/main/res/layout/activity_full_screen_text.xml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Nextcloud Talk application
+  ~
+  ~ @author Marcel Hibbe
+  ~ Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
+  ~
+  ~ This program is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation, either version 3 of the License, or
+  ~ at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~ GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@android:color/white"
+    android:fitsSystemWindows="true"
+    tools:context=".activities.FullScreenTextViewerActivity">
+
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/textview_toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            android:elevation="4dp"
+            android:theme="@style/ThemeOverlay.AppCompat.Light"
+            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
+
+        <TextView
+            android:id="@+id/text_view"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:padding="10dp"
+            tools:text="Lorem Ipsum"/>
+
+</FrameLayout>

app/src/main/res/layout/item_custom_incoming_preview_message.xml

@@ -2,7 +2,9 @@
   ~ Nextcloud Talk application
   ~
   ~ @author Mario Danic
+  ~ @author Marcel Hibbe
   ~ Copyright (C) 2017-2018 Mario Danic <mario@lovelyhq.com>
+  ~ Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
   ~
   ~ This program is free software: you can redistribute it and/or modify
   ~ it under the terms of the GNU General Public License as published by
@@ -48,16 +50,28 @@
         app:flexWrap="wrap"
         app:justifyContent="flex_end">
 
-        <com.facebook.drawee.view.SimpleDraweeView
-            android:id="@id/image"
+        <FrameLayout
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:adjustViewBounds="true"
-            android:scaleType="fitCenter"
             app:layout_flexGrow="1"
             app:layout_wrapBefore="true"
             app:layout_alignSelf="flex_start"
-            tools:src="@tools:sample/backgrounds/scenic"/>
+            android:adjustViewBounds="true">
+
+            <com.facebook.drawee.view.SimpleDraweeView
+                android:id="@id/image"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:scaleType="fitCenter"
+                tools:src="@drawable/ic_call_black_24dp" />
+
+            <ProgressBar
+                android:id="@+id/progress_bar"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:visibility="gone" />
+        </FrameLayout>
 
         <androidx.emoji.widget.EmojiTextView
             android:id="@id/messageText"

app/src/main/res/layout/item_custom_outcoming_preview_message.xml

@@ -2,7 +2,9 @@
   ~ Nextcloud Talk application
   ~
   ~ @author Mario Danic
+  ~ @author Marcel Hibbe
   ~ Copyright (C) 2017-2018 Mario Danic <mario@lovelyhq.com>
+  ~ Copyright (C) 2021 Marcel Hibbe <dev@mhibbe.de>
   ~
   ~ This program is free software: you can redistribute it and/or modify
   ~ it under the terms of the GNU General Public License as published by
@@ -40,17 +42,28 @@
         app:flexWrap="wrap"
         app:justifyContent="flex_end">
 
-        <com.facebook.drawee.view.SimpleDraweeView
-            android:id="@id/image"
+        <FrameLayout
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:adjustViewBounds="true"
-            android:scaleType="fitCenter"
             app:layout_flexGrow="1"
             app:layout_wrapBefore="true"
             app:layout_alignSelf="flex_start"
-            app:actualImageScaleType="fitCenter"
-            tools:src="@tools:sample/backgrounds/scenic"/>
+            android:adjustViewBounds="true">
+
+            <com.facebook.drawee.view.SimpleDraweeView
+                android:id="@id/image"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:scaleType="fitCenter"
+                tools:src="@drawable/ic_call_black_24dp" />
+
+            <ProgressBar
+                android:id="@+id/progress_bar"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:visibility="gone" />
+        </FrameLayout>
 
         <androidx.emoji.widget.EmojiTextView
             android:id="@id/messageText"
@@ -63,7 +76,8 @@
             android:textSize="12sp"
             app:layout_alignSelf="flex_start"
             app:layout_flexGrow="1"
-            app:layout_wrapBefore="true" />
+            app:layout_wrapBefore="true"
+            tools:text="Message" />
 
         <TextView
             android:id="@id/messageTime"
@@ -72,7 +86,8 @@
             android:layout_alignParentEnd="true"
             android:layout_marginStart="8dp"
             android:textColor="@color/warm_grey_four"
-            app:layout_alignSelf="center" />
+            app:layout_alignSelf="center"
+            tools:text="12:34:56" />
     </com.google.android.flexbox.FlexboxLayout>
 
 </RelativeLayout>

app/src/main/res/menu/chat_preview_message_menu.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Nextcloud Talk application
+  ~
+  ~ @author Tobias Kaminski
+  ~ Copyright (C) 2021 Tobias Kaminski <tobias@kaminsky.me>
+  ~
+  ~ This program is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation, either version 3 of the License, or
+  ~ at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~ GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/openInFiles"
+        android:title="@string/open_in_files_app" />
+</menu>

app/src/main/res/menu/menu_preview.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Nextcloud Talk application
+  ~
+  ~ @author Tobias Kaminski
+  ~ Copyright (C) 2021 Tobias Kaminski <tobias@kaminsky.me>
+  ~
+  ~ This program is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation, either version 3 of the License, or
+  ~ at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~ GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/share"
+        android:title="@string/share" />
+</menu>

app/src/main/res/values/strings.xml

@@ -341,6 +341,10 @@
     <string name="nc_delete_message">Delete</string>
     <string name="nc_delete_message_leaked_to_matterbridge">Message deleted successfully, but it might have been leaked to other services</string>
 
+    <string name="share">Share</string>
+    <string name="send_to">Send to</string>
+    <string name="open_in_files_app">Open in Files app</string>
+
     <!-- Upload -->
     <string name="nc_upload_local_file">Upload local file</string>
     <string name="nc_upload_from_cloud">Share from %1$s</string>
@@ -393,7 +397,7 @@
     <string name="scope_published_title">Published</string>
     <string name="scope_published_description">Synchronize to trusted servers and the global and public address book</string>
     <string name="scope_toggle">Scope toggle</string>
-    
+
     <!-- App Bar -->
     <string name="appbar_search_in">Search in %s</string>
 
@@ -403,4 +407,5 @@
     <string name="nc_action_open_main_menu">Open main menu</string>
     <string name="failed_to_save">Failed to save %1$s</string>
     <string name="selected_list_item">selected</string>
+    <string name="filename_progress">%1$s (%2$d)</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -133,6 +133,26 @@
         <item name="android:textColor">@color/white</item>
     </style>
 
+    <style name="FullScreenImageTheme" parent="Theme.AppCompat.Light.NoActionBar">
+        <item name="android:navigationBarColor">@color/black</item>
+        <item name="android:windowNoTitle">true</item>
+        <item name="android:windowActionBar">true</item>
+        <item name="android:windowFullscreen">true</item>
+        <item name="android:windowContentOverlay">@null</item>
+    </style>
+
+    <style name="FullScreenMediaTheme" parent="Theme.AppCompat.Light.NoActionBar">
+        <item name="android:navigationBarColor">@color/black</item>
+        <item name="android:windowNoTitle">true</item>
+        <item name="android:windowActionBar">true</item>
+        <item name="android:windowFullscreen">true</item>
+        <item name="android:windowContentOverlay">@null</item>
+    </style>
+
+    <style name="FullScreenTextTheme" parent="Theme.AppCompat.Light.NoActionBar">
+        <item name="android:navigationBarColor">@color/black</item>
+    </style>
+
     <!-- Launch screen -->
     <style name="AppTheme.Launcher">
         <item name="android:windowBackground">@drawable/launch_screen</item>

app/src/main/res/xml/file_provider_paths.xml

@@ -19,5 +19,10 @@
   -->
 
 <paths>
-    <files-path name="files" path="/" />
+    <files-path
+        name="files"
+        path="/" />
+    <cache-path
+        name="cachedFiles"
+        path="/" />
 </paths>